Small planets' waves have small amplitudes, so you can pick the signal from the noise only after several orbits.

ECONOMIST: Extrasolar planets

They thus have sine waves with large amplitudes and short wavelengths, both of which make them easy to see.

ECONOMIST: Extrasolar planets

The power of Wall Street, in effect, to corner markets worldwide in vital basic commodities, has played havoc with the business cycle and has fostered bubbles, allowing them to occur more often and with ever increasing amplitudes.

FORBES: Commodity Bubble Redux In Full Effect